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/* Machine-dependent ELF dynamic relocation inline functions. Sparc64 version.
Copyright (C) 1997 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#define ELF_MACHINE_NAME "sparc64"
#include <assert.h>
#include <string.h>
#include <link.h>
#include <sys/param.h>
#include <sysdep.h>
/* Return nonzero iff E_MACHINE is compatible with the running host. */
static inline int
elf_machine_matches_host (Elf64_Half e_machine)
{
return e_machine == EM_SPARC64;
}
/* Return the link-time address of _DYNAMIC. Conveniently, this is the
first element of the GOT. This must be inlined in a function which
uses global data. */
static inline Elf64_Addr
elf_machine_dynamic (void)
{
register Elf64_Addr *got asm ("%l7");
return *got;
}
/* Return the run-time load address of the shared object. */
static inline Elf64_Addr
elf_machine_load_address (void)
{
Elf64_Addr here;
__asm("rd %pc,%0\n\t"
"ba 1f\n\t"
" add %0,12,%0\n\t"
".weak __load_address_undefined\n\t"
"call __load_address_undefined\n"
"1:"
: "=r"(here));
return here + (*(int *)here << 2);
}
#ifdef RESOLVE
/* Perform the relocation specified by RELOC and SYM (which is fully resolved).
MAP is the object containing the reloc. */
static inline void
elf_machine_rela (struct link_map *map, const Elf64_Rela *reloc,
const Elf64_Sym *sym, const struct r_found_version *version)
{
Elf64_Addr *const reloc_addr = (void *) (map->l_addr + reloc->r_offset);
Elf64_Addr loadbase;
#ifndef RTLD_BOOTSTRAP
/* This is defined in rtld.c, but nowhere in the static libc.a; make the
reference weak so static programs can still link. This declaration
cannot be done when compiling rtld.c (i.e. #ifdef RTLD_BOOTSTRAP)
because rtld.c contains the common defn for _dl_rtld_map, which is
incompatible with a weak decl in the same file. */
weak_extern (_dl_rtld_map);
#endif
if (ELF64_R_TYPE (reloc->r_info) == R_SPARC_RELATIVE)
{
#ifndef RTLD_BOOTSTRAP
if (map != &_dl_rtld_map) /* Already done in rtld itself. */
#endif
*reloc_addr += map->l_addr + reloc->r_addend;
}
else
{
const Elf64_Sym *const refsym = sym;
Elf64_Addr value;
if (sym->st_shndx != SHN_UNDEF &&
ELF64_ST_BIND (sym->st_info) == STB_LOCAL)
value = map->l_addr;
else
{
value = RESOLVE (&sym, version, ELF64_R_TYPE (reloc->r_info));
if (sym)
value += sym->st_value;
}
value += reloc->r_addend; /* Assume copy relocs have zero addend. */
switch (ELF64_R_TYPE (reloc->r_info))
{
case R_SPARC_COPY:
if (sym->st_size > refsym->st_size
|| (_dl_verbose && sym->st_size < refsym->st_size))
{
const char *strtab;
strtab = ((void *) map->l_addr
+ map->l_info[DT_STRTAB]->d_un.d_ptr);
_dl_sysdep_error ("Symbol `", strtab + refsym->st_name,
"' has different size in shared object, "
"consider re-linking\n", NULL);
}
memcpy (reloc_addr, (void *) value, MIN (sym->st_size,
refsym->st_size));
break;
case R_SPARC_GLOB_DAT:
/* case R_SPARC_64: */
case R_SPARC_JMP_SLOT:
*reloc_addr = value;
break;
case R_SPARC_8:
*(char *) reloc_addr = value;
break;
case R_SPARC_16:
*(short *) reloc_addr = value;
break;
case R_SPARC_DISP8:
*(char *) reloc_addr = (value - (Elf64_Addr) reloc_addr);
break;
case R_SPARC_DISP16:
*(short *) reloc_addr = (value - (Elf64_Addr) reloc_addr);
break;
case R_SPARC_DISP32:
*(unsigned int *)reloc_addr = (value - (Elf64_Addr) reloc_addr);
break;
case R_SPARC_LO10:
*(unsigned *)reloc_addr = (*(unsigned *)reloc_addr & ~0x3ff)
| (value & 0x3ff);
break;
case R_SPARC_WDISP30:
*(unsigned *)reloc_addr = ((*(unsigned *)reloc_addr & 0xc0000000)
| ((value - (Elf64_Addr) reloc_addr) >> 2));
break;
case R_SPARC_HI22:
*(unsigned *)reloc_addr = (*(unsigned *)reloc_addr & 0xffc00000)
| (value >> 10);
break;
case R_SPARC_NONE: /* Alright, Wilbur. */
break;
default:
assert (! "unexpected dynamic reloc type");
break;
}
}
}
static inline void
elf_machine_lazy_rel (struct link_map *map, const Elf64_Rela *reloc)
{
switch (ELF64_R_TYPE (reloc->r_info))
{
case R_SPARC_NONE:
break;
case R_SPARC_JMP_SLOT:
break;
default:
assert (! "unexpected PLT reloc type");
break;
}
}
#endif /* RESOLVE */
/* Nonzero iff TYPE should not be allowed to resolve to one of
the main executable's symbols, as for a COPY reloc. */
#define elf_machine_lookup_noexec_p(type) ((type) == R_SPARC_COPY)
/* Nonzero iff TYPE describes relocation of a PLT entry, so
PLT entries should not be allowed to define the value. */
#define elf_machine_lookup_noplt_p(type) ((type) == R_SPARC_JMP_SLOT)
/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */
#define ELF_MACHINE_RELOC_NOPLT R_SPARC_JMP_SLOT
/* The SPARC never uses Elf64_Rel relocations. */
#define ELF_MACHINE_NO_REL 1
/* Set up the loaded object described by L so its unrelocated PLT
entries will jump to the on-demand fixup code in dl-runtime.c. */
static inline int
elf_machine_runtime_setup (struct link_map *l, int lazy)
{
Elf64_Addr *got;
extern void _dl_runtime_resolve (Elf64_Word);
if (l->l_info[DT_JMPREL] && lazy)
{
got = (Elf64_Addr *) (l->l_addr + l->l_info[DT_PLTGOT]->d_un.d_ptr);
got[1] = (Elf64_Addr) l; /* Identify this shared object. */
/* This function will get called to fix up the GOT entry indicated by
the offset on the stack, and then jump to the resolved address. */
got[2] = (Elf64_Addr) &_dl_runtime_resolve;
}
return lazy;
}
/* This code is used in dl-runtime.c to call the `fixup' function
and then redirect to the address it returns. */
#define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\
.globl _dl_runtime_resolve
.type _dl_runtime_resolve, @function
_dl_runtime_resolve:
save %sp, -160, %sp
mov %g1, %o1
call fixup
mov %g2, %o0
jmp %o0
restore
.size _dl_runtime_resolve, .-_dl_runtime_resolve
");
/* The PLT uses Elf64_Rela relocs. */
#define elf_machine_relplt elf_machine_rela
/* Mask identifying addresses reserved for the user program,
where the dynamic linker should not map anything. */
#define ELF_MACHINE_USER_ADDRESS_MASK ???
/* Initial entry point code for the dynamic linker.
The C function `_dl_start' is the real entry point;
its return value is the user program's entry point. */
#define __S1(x) #x
#define __S(x) __S1(x)
#define RTLD_START __asm__ ( "\
.global _start
.type _start, @function
_start:
/* Make room for functions to drop their arguments on the stack. */
sub %sp, 6*8, %sp
/* Pass pointer to argument block to _dl_start. */
call _dl_start
add %sp," __S(STACK_BIAS) "+22*8,%o0
/* FALLTHRU */
.global _dl_start_user
.type _dl_start_user, @function
_dl_start_user:
/* Load the GOT register. */
1: rd %pc,%g1
sethi %hi(_GLOBAL_OFFSET_TABLE_-(1b-.)),%l7
or %l2,%lo(_GLOBAL_OFFSET_TABLE_-(1b-.)),%l7
add %l7,%g1,%l7
/* Save the user entry point address in %l0. */
mov %o0,%l0
/* See if we were run as a command with the executable file name as an
extra leading argument. If so, adjust the stack pointer. */
sethi %hi(_dl_skip_args), %g2
or %g2, %lo(_dl_skip_args), %g2
ld [%l7+%g2], %i0
brz,pt %i0, 2f
ldx [%sp+" __S(STACK_BIAS) "+22*8], %i1
sub %i1, %i0, %i1
sllx %i0, 3, %i2
add %sp, %i2, %sp
stx %i1, [%sp+" __S(STACK_BIAS) "+22*8]
/* Load _dl_default_scope[2] to pass to _dl_init_next. */
2: sethi %hi(_dl_default_scope), %g2
or %g2, %lo(_dl_defalt_scope), %g2
add %g2, 2*8, %g2
ldx [%l7+%g2], %l1
/* Call _dl_init_next to return the address of an initializer to run. */
3: call _dl_init_next
mov %l1, %o0
brz,pn %o0, 4f
nop
jmpl %o0, %o7
nop
ba,a 3b
/* Clear the startup flag. */
4: sethi %hi(_dl_starting_up), %g2
or %g2, %lo(_dl_starting_up), %g2
st %g0, [%l7+%g2]
/* Pass our finalizer function to the user in %g1
sethi %hi(_dl_fini), %g1
or %g1, %lo(_dl_fini), %g1
ldx [%l7+%g1], %g1
/* Jump to the user's entry point & undo the allocation of the xtra regs. */
jmp %l0
add %sp, 6*8, %sp
.size _dl_start_user, .-_dl_start_user");
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